atan2: Difference between revisions
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Lou Montana (talk | contribs) m (Text replacement - "\[\[SQF[ _]syntax" to "[[SQF Syntax") |
Lou Montana (talk | contribs) m (Text replacement - "<code>([^\[]+)<\/code>" to "<sqf>$1</sqf>") |
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{{RV|type=command | {{RV|type=command | ||
| ofp | |game1= ofp | ||
|version1= 1.00 | |||
|1.00 | |game2= ofpe | ||
|version2= 1.00 | |||
|game3= arma1 | |||
|version3= 1.00 | |||
|game4= arma2 | |||
|version4= 1.00 | |||
|game5= arma2oa | |||
|version5= 1.50 | |||
|game6= tkoh | |||
|version6= 1.00 | |||
|game7= arma3 | |||
|version7= 0.50 | |||
|gr1= Math - Geometry | |gr1= Math - Geometry | ||
| ArcTangent of ''x | |descr= [[Image:atan.jpg|right|200px]] ArcTangent of ''y/x''. Used to determine the angle of a vector ''[x,y]''. Result in [[Number#Degrees|Degrees]] between -180 and 180. | ||
{{Feature | Informative | This command can handle ''x'' being 0, unlike when using [[atan]], and will return 90 }} | |||
{{Feature | Informative | This command can handle '' | {{Feature | important | Even though this command is a binary operator just like [[select]] command, it has [[SQF Syntax#Rules_of_Precedence | higher precedence]] than [[select]] command, therefore the following expression: <br>{{hl|_pos select 0 [[atan2]] (_pos select 1)}}<br> will produce an error. The correct usage in this case will be: <br>{{hl|(_pos select 0) [[atan2]] (_pos select 1)}}}} | ||
{{Feature | important | Even though this command is a binary operator just like [[select]] command, it has [[SQF Syntax#Rules_of_Precedence | higher precedence]] than [[select]] command, therefore the following expression: <br> | |||
| x | |s1= y [[atan2]] x | ||
|p1= | |p1= y: [[Number]] | ||
|p2= | |p2= x: [[Number]] | ||
| [[Number]] | |r1= [[Number]] | ||
|x1= <sqf>_xy = [5,3]; | |||
_degrees = (_xy select 0) atan2 (_xy select 1); // 59.0362</sqf> | |||
|x1= < | |||
_degrees = (_xy | |||
|x2= Get direction from _obj1 to _obj2:< | |x2= Get direction from _obj1 to _obj2: | ||
_dir = (_vd | <sqf>_vd = getPosASL _obj2 vectorDiff getPosASL _obj1; | ||
_dir = (_vd select 0) atan2 (_vd select 1); // _dir range from -180 to +180 | |||
_dir = (_dir + 360) % 360; // _dir range from 0 to 360</sqf> | |||
|x3= Get relative direction from _obj1 to _obj2:< | |x3= Get relative direction from _obj1 to _obj2: | ||
_dir = (_xy | <sqf>_xy = _obj1 worldToModel getPosASL _obj2; | ||
_dir = (_xy select 0) atan2 (_xy select 1); // _dir range from -180 to +180 | |||
_dir = (_dir + 360) % 360; // _dir range from 0 to 360</sqf> | |||
|seealso= [[atan]] | |seealso= [[atan]] [[tan]] [[sin]] [[cos]] [[asin]] [[acos]] [[rad]] [[pi]] [[vectorCos]] [[getPos]] [[getRelPos]] [[Math Commands]] | ||
}} | }} | ||
<dl class="command_description"> | <dl class="command_description"> | ||
< | |||
<dt></dt> | |||
<dd class="notedate">Posted on 08:00, 18 November 2009</dd> | <dd class="notedate">Posted on 08:00, 18 November 2009</dd> | ||
<dt class="note">[[User:KeV|KeV]]<dd class="note"> | <dt class="note">[[User:KeV|KeV]]</dt> | ||
<dd class="note"> | |||
To get the direction of an object from the player: | To get the direction of an object from the player: | ||
< | <sqf>_dir = ((getPos _obj select 0) - (getPos player select 0)) atan2 ((getPos _obj select 1) - (getPos player select 1)); | ||
//_dir will be from -180 to 180. | //_dir will be from -180 to 180. | ||
</ | </sqf> | ||
If positive values are needed then use: | If positive values are needed then use: | ||
< | <sqf>if (_dir < 0) then {_dir = _dir + 360};</sqf> | ||
</ | |||
Or just use [[BIS_fnc_dirTo]] directly. | Or just use [[BIS_fnc_dirTo]] directly. | ||
</dl> | </dl> | ||
Revision as of 20:08, 13 May 2022
Description
- Description:
- ArcTangent of y/x. Used to determine the angle of a vector [x,y]. Result in Degrees between -180 and 180.
- Groups:
- Math - Geometry
Syntax
Examples
- Example 1:
- Example 2:
- Get direction from _obj1 to _obj2:
- Example 3:
- Get relative direction from _obj1 to _obj2:
Additional Information
Notes
-
Report bugs on the Feedback Tracker and/or discuss them on the Arma Discord or on the Forums.
Only post proven facts here! Add Note
- Posted on 08:00, 18 November 2009
- KeV
-
To get the direction of an object from the player:
If positive values are needed then use: Or just use BIS_fnc_dirTo directly.
Categories:
- Scripting Commands
- Introduced with Operation Flashpoint version 1.00
- Operation Flashpoint: New Scripting Commands
- Operation Flashpoint: Scripting Commands
- Operation Flashpoint: Elite: Scripting Commands
- ArmA: Armed Assault: Scripting Commands
- Arma 2: Scripting Commands
- Arma 2: Operation Arrowhead: Scripting Commands
- Take On Helicopters: Scripting Commands
- Arma 3: Scripting Commands
- Command Group: Math - Geometry